Need Help reading xml files from microsoft onedrive app folder

i am developing a windows 8 app in which i am trying to read xml files from Microsoft onedrive folder. The xml files get synced from onedrive to a particular folder. But when i an trying to read these synced xml files using StorgeFile.OpenAsync(FileAccess.Read) i get the following exception:

System.Unauthorized Exception occured in mscorlib.dll HRESULT:0X80070005(E_ACCESSDENIED)

I am able to copy these synced files to some other location and also when i copy these files to some other location and paste it back to OneDrive folder i am able to read them